Groundwater quality of Pageru river basin, Cuddapah district, Andhra Pradesh

摘要

The study was undertaken to assess the water quality in relation to agricultural and domestic uses in parts of Pageru river basin, Andhra Pradesh. The rock formation of study area is Cuddapah Supergroup and Kurnool Group. The important lithounits consist chiefly of quartzite, limestone and shale. The results of chemical analyses of ninety-nine water samples were collected from bore wells. The quality analysis is made through the estimation of silica, calcium, magnesium, sodium, potassium, carbonate, bicarbonate, sulphate, chloride, total dissolved solids, Hydrogen ion concentration (pH) and specific conductance. Based on the analyses, certain parameters like non-carbonate hardness, sodium adsorption ratio, percent sodium, potential salinity, residual sodium carbonate, Kelly's ratio, magnesium ratio, index of base exchange and permeability were calculated. From the evaluation, it is known that the water quality is suitable for both domestic and irrigation purposes. According to Gibb's diagram all the samples in both the seasons fall in the rock dominance field. Assessment of water samples from various methods proved that majority of the water samples are good either for drinking or for agriculture in both seasons. The overall quality of waters in the study area in post-monsoon season in all constituents are high because of rock-water interaction and rules out any pollution from extraneous sources.